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[Nintonito]

(03-07-2015, 11:10 AM)Kwee Wrote:

(03-07-2015, 05:43 AM)tueidj Wrote: I wouldn't call ARMv7 "bad, slow and limited compared to ARMv8" either. If you look at the recently released instruction timings for the A57 they're not substantially faster than the old A8 timings. The big differences are mainly from hardware division support being mandatory and no need for backwards compatibility with older models which caused unaligned memory access to always be handled by software, even though ARMv6+ hardware can handle it.

Armv8 support [color=#252525]AES encrypt/decrypt and SHA-1/SHA-2 hashing instructions, have more general purpose registers(13 vs 31), [color=#252525]dedicated SP, [color=#252525]Advanced SIMD (NEON) enhanced : [/color][/color][/color]32× 128-bit registers (up from 16), also accessible via VFPv4 and supports double-precision floating point.

 most of those extras are situational in usage for normal applications.  Unless the app is using transcoded x86 libraries,  they won't need those extra features for any core functions.  I think you're being a bit harsh on the differences.